Word: phosphors
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Dates: during 1950-1959
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...standard TV tube, the picture is formed by a slim beam of electrons scanning back and forth across the phosphor on its front face, like a garden hose washing a wall. The Willys tube works on the same general principle, but it has no large empty space. It is made of two glass plates an inch or so apart, with a vacuum between. The electron beam enters from an upper corner. The electrons move horizontally between the glass sheets and stream past metal "deflection plates...
...these plates carries the proper electrical charge, it deflects the electron beam downward. On their way down the electrons pass horizontal deflection plates and are turned sharply against the forward glass plate, which carries a picture-forming phosphor. When the voltage on both sets of deflection plates is changed simultaneously, the electron beam scans the phosphor, sweeping across it and producing a TV picture...
...even more radical flat tube under development by General Electric Co. gets rid of the vacuum, and it has no electron beam either. It consists of a sheet of "electroluminescent" phosphor that glows when it is excited by an electrical voltage. The phosphor is sandwiched between a matrix of horizontal and vertical wires. If there are 500 running in each direction there will be 250,000 points at which wires cross. These intersections can be made to glow by impressing the proper voltage on the wires. If the voltages are changed rapidly, the spot of light scans the screen, forming...
...trick is done by a zinc sulphide "phosphor" (a substance that glows when light strikes it) sandwiched between two conducting films, one of them transparent. When an electric voltage is applied across the films, the phosphor takes energy from it and uses it to increase by "electroluminescence" the brightness of the light image...
Electron Switching. The trick in color television is to make the electrons that represent red, for example, hit the phosphor that glows in red. In the Lawrence tube, the wire grid does this switching job. It is hooked up, through the proper electronic apparatus, to the signal that comes over the air. When the signal tells it that certain electrons represent red, the wires of the grid are charged with enough electrical potential to focus the electron beam onto a line of red phosphor. When "green" electrons come along, it switches them to green phosphor, etc. So, jumping from phosphor...